Someone recently asked about determining if a point resides within a polyline using VBA. There are a few ways to achieve this, some being more complex than others, each with their own advantages. However, there is one way that is particularly simple within the AutoCAD® environment, as we are able to use built in features such as the IntersectWith method. The concept for finding out if a point is within a polyline is this – if we were to draw a line from the point in any direction to infinity, the number of intersections the line would have with the polyline would be an odd number. Think about it – if it was a square, it would cross the polyline once.

For irregular shapes where the line crosses it many times, it firstly has to exit the shape – any re-entry to the shape must have a corresponding exit – so if the point is within the polyline, any line eminating from it to infinity must cross the boundary an odd number of times. And for the same reason, any point outside the boundary must cross the boundary an even number of times. So, armed with this knowledge, we need a way to actually achieve this in AutoCAD®. And what better way of doing so is there than to simply draw a Ray in any direction, and find out how many intersections with the boundary there are?

I’m afraid not at this time – I can absolutely have a bash at it for you if you want, but it would probably be a better learning experience for you if you tried to get it going yourself. I do have a tutorial which should point you in the right direction with.NET, and it should contain everything you need to port over VBA code to.NET. Have a look on this site for my Introduction to VB.NET.

If you still need help, please don’t hesitate to ask. I am always willing to provide help on a 1 on 1 basis. Hello Will, This is a nice little program. HOWEVER, it is true that in some cases this approach will fail on PLs with irregular shapes, i.e. If the ray crosses once and then just “touches” one point on the outside, forming something like a “tangent”. Or what if the PL crosses itself and the ray crosses exactly through such a crossing point.

The Visual Basic for Applications (VBA) engine is no longer provided with your AutoCAD OEM installation media. Please contact your Autodesk ISV partner representative for more information. Boris uvajdov kniga pobeda nad rakom en. * Includes the Autodesk Genuine Service which tests for certain types of non-genuine Autodesk software. Jul 2, 2006 - I've just started learning VBA in CAD.I wanna select polyline onscreen and then get its coordinate(of every vertex).But I don't know how to do it.

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Or if the ray crosses a section of a PL where two lines of the this same PL are drawn exactly on top of each other. In these 3 examples your program returns the wrong result and I am not sure if I found all the exeptions.

Besides, it allowes to select PLs and points that are not on the same planar surface. In such a case your program says that the point is outside and it could be correctly considered to be outside of the PL, only it looks to the user as if it was inside. (I would have posted a sample drawing but did not find a way how to do it.) Kind regards, Stephan •.